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在大田试验条件下设氮肥用量分别为N0(不施氮肥)、施氮120(N120)、200(N200)、280(N280)和360 kg/hm2(N360)5个处理,测定叶面积和叶绿素含量、净光合速率(Pn)、气孔导度(Gs)、胞间二氧化碳浓度(Ci)、蒸腾速率(Tr)和产量,探讨不同施氮量对利民33光合特性及产量的影响。研究结果表明,随施氮量的增加,利民33叶面积指数、叶绿素含量、净光合速率、光能利用率提高,进而提高产量;产量与净光合速率、气孔导度、蒸腾速率和光能利用率呈正相关,与胞间二氧化碳浓度呈负相关;产量与施氮量的回归方程为Y=-0.05x2+32.38x+6 351(R2=0.98),最高产量施氮量为335.9 kg/hm2。
Nitrogen application rates were set as N0 (no nitrogen fertilizer), N20 (N20), 200 (N200), 280 (N280) and 360 kg / hm2 (N360) under field experiment. Leaf area and chlorophyll , Photosynthetic rate (Pn), stomatal conductance (Gs), intercellular carbon dioxide (Ci), transpiration rate (Tr) and yield were measured to investigate the effects of N rates on photosynthetic characteristics and yield of Limin 33. The results showed that the leaf area index, chlorophyll content, net photosynthetic rate and photosynthetic rate of Limin33 increased with the increase of nitrogen application rate, and then increased the yield. The yield and net photosynthetic rate, stomatal conductance, transpiration rate and light energy utilization (R = 0.98). The highest yield of nitrogen application was 335.9 kg / hm2. The regression equation of yield and nitrogen application rate was Y = -0.05x2 + 32.38x + 6 351 (R2 = 0.98).